Method of Stationary Phase

Natural & Formal Sciences Dictionary
An asymptotic technique for approximating integrals with highly oscillatory integrands by isolating and expanding contributions from points where the oscillatory phase has vanishing derivative (stationary points).

Method of Stationary Phase

- Mathematics & Logic -
Pure Mathematics Dictionary
An asymptotic method for estimating integrals with highly oscillatory phases of the form ∫ A(x) e^{iλ φ(x)} dx for large parameter λ, focusing on contributions from points where the phase derivative φ'(x) vanishes (stationary points).